Heritage Express (a division/trading name of THNSW) run the tours. Latest advice is that there are a number of locos (2705, 3642,3265) scheduled for repair/maintenance restoration, including those already part way through overhauls (3526,3801).
Given the funds being pumped into THNSW by the state government each year, there is no prospect of them folding (unless there is a change of Premier/Government who have a different policy).
PS; You really should have placed this thread in the Preservation and Tourist Railways Forum. That would have drawn a flood of responses.
PS2; I shouldn't respond to trolling, should I.